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Título
Bioaugmentation Treatment of a PAH-Polluted Soil in a Slurry Bioreactor
Autor
Facultad/Centro
Área de conocimiento
Título de la revista
Applied Sciences
Número de la revista
8
Cita Bibliográfica
Forján, R.; Lores, I.; Baragaño, D.; Gallego, J. L. R.; Peláez, A. I.; Sierra Fernández, C. (2020). Bioaugmentation Treatment of a PAH-Polluted Soil in a Slurry Bioreactor. Applied Sciences, 10(8), https://doi.org/10.3390/APP10082837
Editorial
MDPI
Fecha
2020
Resumen
[EN] A bioslurry reactor was designed and used to treat loamy clay soil polluted with polycyclic
aromatic hydrocarbons (PAHs). To this end, biostimulation alone, or combined with bioaugmentation
with two bacterial strains (Rhodocccus erythropolis and Pseudomonas stuzeri) previously isolated from
the polluted site, was applied. The PAH concentrations decreased notably after 15 days in all
of the treatments. The concentrations of the two- and three-ring compounds fell by >80%, and,
remarkably, the four- to six-ring PAHs also showed a marked decrease (>70%). These results thus
indicate the capacity of bioslurry treatments to improve, notably, the degradation yields obtained in a
previous real-scale remediation carried out using biopiles. In this sense, the remarkable results for
recalcitrant PAHs can be attributed to the increase pollutants’ bioavailability achieves in the slurry
bioreactors. Regarding bioaugmentation, although treatment with R. erythropolis led to a somewhat
greater reduction of lighter PAHs at 15 days, the most time-effective treatment was achieved using
P. stutzeri, which led to an 84% depletion of total PAHs in only three days. The effects of microbial
degradation of other organic compounds were also monitored by means of combined qualitative and
quantitative gas chromatography mass spectrometry (GC–MS) tools, as was the evolution of microbial
populations, which was analyzed by culture and molecular fingerprinting experiments. On the basis
of our findings, bioslurry technology emerges as a rapid and operative option for the remediation of
polluted sites, especially for fine soil fractions with a high load of recalcitrant pollutants.
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